1893.] Mineralogy and Petrography. x 1007 
time of its imprisonment. From the distribution of these inclusions the 
author concludes that the crystals were first cubes, then tetrahexahedra 
(20% ), and finally cubes, as at present. 
Jannetaz" has made an analysis of the black garnet pyreneite, now 
the subject of so much discussion" in Europe, and has found it to con- 
sist of: 
SiO, | ALO, FeO MgO  CaO Total 
544 — 100 . 185. X0 > Gpl 10091 
It is thus neither melanite nor grossularite, but is intermediate in com- 
position between the two. Its density is 3.7 
Miers” has succeeded in obtaining some excellent though tiny crys- 
tals of orpiment by dissolving in hydrochloric acid the marl in which 
nodules of this substance are found at Tajowa, Hungary. Under the 
microscope the little crystals appear with the orthorhombic symmetry. 
oP is the plane of their optical axes. Their axial angle for sodium 
light is 70° 24’ in air. 
The same mineralogist" has repested Gmelius’ analysis of helvite 
from Schwarzenberg, and has obtained this result: 
BO Feo AMuO BO ALO, CoO ^8 Total 
31.85 426 42.47 14.25 74 3.16 4.81— 101.54 
Dumortierite is recorded by Gonnard" as occurring in the feldspar 
of a granite vein cutting the gneiss in a quarry at Terniéres, Franche- 
ville, Dept. of the Rhone, France. 
he same writer” figures a few new types of natrolite crystals from 
the Puy-de-Dóm, and describes” the occurrence of crystals of analeite 
in the fissures of the porphyry at Agay, Canton Hyères, France. 
Brazilite, analyzed by Blomstrand," has the following composition : 
ZrO, SiO, ALO, FeO, CaO MgO .Alk Los Total 
96.52 .70  .48 41 55 400 44 o 8o = 0.82 
Experiments in Crystallization.—Hundt" has repeated Vogel- 
NH Bull. d. 1. Soc. Franc: d, Min., xv, p. 127. 
18 AMERICAN NATURALIST, Oct., 1892, p. 849. Ib., Apr., 1893, p. 385. 
?? Miner. Magazine, x, p. 24 
T" Ib, X, p. 10: 
?! Bull. Soc. Franc. d. Min., xv, p. 230. 
” D, b. 221. 
2 Neues Jahrb. f. Min., etc., 1893, I, p. 89. 
j 
